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Eighth International Symposium on Turbulence and Shear Flow Phenomena
August, 28-30, 2013, Poitiers, Futuroscope, France

DOI: 10.1615/TSFP8

EFFECT OF TURBULENT TO LAMINAR FLOW TRANSITION ON SURFACE REACTION AND PARTICLE DEPOSITION IN A SQUARE DUCT

pages 1-6
DOI: 10.1615/TSFP8.980
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RESUMO

A monolith reactor is widely used to reduce pollutant matter in the industrial field. A monolith reactor, which consist of many rectangular channels, although flue gas flows into the channel inlet in turbulent condition, flue gas transitions from turbulent to laminar flow due to the small hydraulic diameter of a single channel. In order to develop a higher performance reactor, optimize the maintenance schedule and extend lifetime of reactor, it is important to understand reaction and degradation mechanism in a monolith reactor. In this study, surface reaction behaviour occurred on the wall and particle adhesion behaviour is investigated performing a direct numerical simulation (DNS). The results show that both surface reaction and particle adhesion are promoted by turbulent eddies which exists in the upstream region. However, the region which exhibits the effect of turbulent eddies is different. For particle deposition, the effect of turbulent eddies exhibits only in the upstream region, whereas for surface reaction, such effect also exhibits in the downstream region. This is because of the remaining cross-sectional fluid motion caused by the inflow turbulence. The magnitude of the cross-sectional fluid motion is weak, hence such motion only affects gaseous flow and cannot affect heavy particle motion.

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